I can sort of see it. It's definitely not evenly lit. It's up to you (obviously) if you want to bring it in. IMO, such an expensive machine should be perfect. At this time, it would probably be tough to get a new one, though.

If you didn't buy AppleCare, I would get it now. I bought it with mine because it's a first gen product, and you never know what will go wrong.

Also, I've heard that Apple tends to be a bit more lenient with repairs/replacements, even in the first year of warranty, if they see that you've got it.

I'm not sure if this is normal or not. I just tested my brand new iMac 21.5

Take a look at the lower right hand corner. Do you see any problem??? Or maybe just my eyes are too sensitive.

Also, I noticed that the iMac isn't as quiet as I thought. i can hear fan noise coming from the back of iMac when I was updating the OS X and other software. I don't know if it's normal on iMac.

Whoever told you or led you to believe that iMacs were silent was wrong.
And the new model only has 1 fan, the old one had 2. just browsing and email it won't make much noise aside from the HDD, but if you push the cpu it can get very noisy. But besides, how often do you work with your ears on the back of the iMac and not the front?

Your eyes are not overly sensitive it has uneven back lighting, and also the tint issue on the lower right hand corner.

-fan noise may he spotlight still indexing?
-i can see lots of uneven yellow tint in lower right...maybe glue curing issue like last imacs,and goes away in few days of use?...if not i would take back and get another.

I didn't intentionally look for defects. i just accidentally noticed it as I was browsing web. I feel that the center tends to be brighter and other area is darker/ yellow.

You could take it back. In my experience, only a fraction of them are really perfect, but you'll notice it more under certain circumstances. Store lighting is bright, and they tend to turn the backlights to their maximum settings. In such a setting, you're less likely to notice it. If it bothers you, I'd exchange it now rather than wait to see what they say later. Oh and the fan noise just is what it is. I assume this is one of the new ones. They may be noisier if higher RPMs are required due to tight space or smaller fans. If it's new, you probably had a few background processes going, such as the initial drive indexing. Check activity monitor for details.

How does it look with a black jpeg in a dim room? Blobs all over? I don't mind the slight yellowing no picture will be uniform, slight clouding isn't bad either but if there are serious Lightbleed forget it

How does it look with a black jpeg in a dim room? Blobs all over? I don't mind the slight yellowing no picture will be uniform, slight clouding isn't bad either but if there are serious Lightbleed forget it

I literally gasped when I saw that, and I'm still not sober from the night before nope that's unacceptable!!! Sorry but if that was me i'd be calling apple immediately, never will I pay that much for a product where the screen s as defective as that!